As you have described the child is having step ladder fever which points towards typhoid fever. However other symptoms need  to be ascertained by a detailed history. Cbc and other reports need to be seen and evaluated.What antibiotics is he taking. A complete information is needed. Also get a urine routine done.

Continue paracetamol.

Do sponging

Continue paracetamol Do urine test

Do Chest X ray and Complete urine examination test also

An 8-year-old with fever for 10 days requires re-evaluation by a pediatrician, even if the initial tests are negative. A negative dengue, malaria, typhoid, and scrub typhus workup does not rule out all causes of prolonged fever. Possible causes include: * A viral illness with a prolonged course (including EBV/CMV) * A bacterial infection not covered by the current antibiotic (such as a urinary tract infection, sinusitis, pneumonia, or an occult abscess) * Less commonly, tuberculosis, inflammatory diseases (such as Kawasaki disease or systemic juvenile idiopathic arthritis), or hematological disorders. At this stage, your child should be examined again and may require further investigations such as: * Repeat CBC with peripheral smear and CRP/ESR * Urine routine and urine culture * Blood culture (preferably before changing antibiotics, if feasible) * Chest X-ray if respiratory symptoms are present * Liver and kidney function tests * Additional tests guided by the examination (e.g., EBV/CMV, TB evaluation, autoimmune markers, or imaging if indicated). Do not change or add antibiotics on your own, as this can delay diagnosis. Ensure adequate fluids and give paracetamol 10–15 mg/kg per dose only for fever or discomfort. If she has persistent high fever (104°F), difficulty breathing, severe lethargy, persistent vomiting, rash, seizures, neck stiffness, or reduced urine output, seek urgent medical care or hospitalization. Since the fever has persisted for 10 days, I recommend a pediatrician review today for a detailed examination and targeted investigations rather than continuing empirical treatment alone.